<template>
  <div class="category">
    <ul>
      <li @click="selectFirstCategory({})" :class="{active: !firstCategorySelected.id}">全部</li>
      <!--指令-->
      <li v-for = "(category,index) in firstCategoryList"
          :key="index"
          :class="{active: category.id === firstCategorySelected.id}"
          @click="selectFirstCategory(category)">{{category.name}}</li>
    </ul>
    <!-- 显示父分类下的子分类-->
    <ul v-if="firstCategorySelected.id">
      <li @click="selectSecondCategory({})" :class="{active: !secondCategorySelected.id}">全部</li>
      <li v-for = "(category,index) in secondCategoryList"
          :key="index"
          :class="{active: category.id === secondCategorySelected.id}"
          @click="selectSecondCategory(category)"
      >{{category.name}}</li>
    </ul>
  </div>
  <!-- 显示搜索到的商品-->
  <div class="goodsList">
    <ul>
      <li v-for="(goods, index) in pageInfo.list" :key="index" @click="toGoodsView(goods.id)">
        <div class="pic">
          <el-image :src="`${SERVER_ADDR}/goods/pic/${goods.picList[0].url}`"/>
        </div>
        <div class="name">{{ goods.name }}</div>
        <div class="dscp">{{ goods.dscp }}</div>
        <div class="price">￥{{ goods.price }}</div>
      </li>
    </ul>
    <el-row class="row-bg" justify="center" style="margin-top: 20px;">
      <el-pagination background layout="prev, pager, next"
                     v-model:current-page="pageInfo.pageNum"
                     :page-count="pageInfo.pages"
                     @update:current-page="search" />
    </el-row>
  </div>
</template>

<script setup>
import {ref, watch} from "vue";
import categoryApi from "@/api/categoryApi.js";
import goodsApi from "@/api/goodsApi.js";
import {useRoute, useRouter} from "vue-router";
const route=useRoute();
const router=useRouter();
//服务器地址
const SERVER_ADDR = ref(import.meta.env.VITE_SERVER_ADDR)
const props = defineProps({
  categoryId: String
});
//所有需要显示的父分类
const firstCategoryList = ref([]);
//显示需要显示的子分类
const secondCategoryList = ref([]);
//被选中的父分类
const firstCategorySelected = ref([]);
//被选中的子分类
const secondCategorySelected = ref([]);
//被选中的分类id--可能是父分类id也可能是子分类id
const categoryId = ref(null);
//分页信息
const pageInfo = ref({
  pages:0,
  pageSize: 0,
  pageNum:0
});
//通过路径传输的传输发生变化进行处理
watch(props, () => {
  getParent();
});



//点击父分类调用的函数
function selectFirstCategory(category){
  //给选择的父分类赋值
  firstCategorySelected.value=category;
  //每次点击清空里面的数据
  secondCategoryList.value=[];
  //被选中的id赋值
  if(firstCategoryList.value.id){
    categoryId.value = firstCategorySelected.value.id;
  }else {
    categoryId.value = null;
  }

  //给被选中的父分类下的子分类赋值
   if(category.childList){
     secondCategoryList.value=category.childList;
     // category.childList
     //     .filter(c=> c.status === 1)
     //     .forEach(c=> secondCategoryList.value.push(c));
   }
   selectSecondCategory({});
   //查询商品
search(1);
}
//点击子分类调用的函数
function selectSecondCategory(category){
  secondCategorySelected.value=category;
  //被选中的id赋值
  if(secondCategorySelected.value.id){
    categoryId.value = secondCategorySelected.value.id;
  }else {
    categoryId.value=firstCategorySelected.value.id;
  }
  search(1);
}


//获取所有的父分类 1.上架
function getParent() {
  const condition = {
    id: 0,
    recom:1,
    status:1
  };
  categoryApi.selectByPage(condition)
      .then(resp => {
        firstCategoryList.value = resp.data;
        let flag=true;
        firstCategoryList.value.forEach(c => {
          if(props.categoryId == c.id){
            flag=false;
            selectFirstCategory(c);
          }
        });
        if(flag === true){
          selectFirstCategory({});
        }
      });
}
//搜索
function search(pageNum){
  const condition={
    status: 1,
    categoryId:categoryId.value,
    name:route.query.goodsName
  };
  goodsApi.selectByPage1(condition,pageNum,20)
      .then(resp=>{
        pageInfo.value=resp.data;
      });
}


function toGoodsView(id){
  router.push({
    path:'/user/goods',//跳转到的位置，值和页面路由中配置的路径相同
    query:{
      id
    }
  });
}
getParent();
</script>
<style scoped>
.category ul li {
  float: left;
  margin: 10px 20px;
  font-size: 14px;
  cursor: pointer;
}
.active{
  color: var(--theme-color);
  font-weight: bold;

}
.goodsList ul li {
  width: 224px;
  float: left;
  margin-right: 20px;
  text-align: center;
  margin-bottom: 10px;
  background-color: #EEE;
  cursor: pointer;
}
.goodsList ul li:hover {
  box-shadow: 0px 0px 20px #000;
}
.goodsList ul li:nth-child(5n) {
  margin-right: 0px;
}
.name, .dscp, .price {
  line-height: 25px;
}

.name {
  font-size: 16px;
  font-weight: bold;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.dscp {
  color: #333;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.price {
  font-size: 12px;
  font-weight: bold;
  color: var(--theme-color);
}

</style>